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<title>FatFs - f_sync</title>
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<h2>f_sync</h2>
<p>The f_sync function flushes the cached information of a wriiting file.</p>
<pre>
FRESULT f_sync (
  FIL* <em>FileObject</em>     /* Pointer to the file object */
);
</pre>
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<div class="para">
<h4>Parameters</h4>
<dl class="par">
<dt>FileObject</dt>
<dd>Pointer to the open file object to be flushed.</dd>
</dl>
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<div class="para">
<h4>Return Values</h4>
<dl class="ret">
<dt>FR_OK (0)</dt>
<dd>The function succeeded.</dd>
<dt>FR_RW_ERROR</dt>
<dd>The function failed due to a disk error or an internal error.</dd>
<dt>FR_NOT_READY</dt>
<dd>The disk drive cannot work due to no medium in the drive or any other reason.</dd>
<dt>FR_INVALID_OBJECT</dt>
<dd>The file object is invalid.</dd>
</dl>
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<div class="para">
<h4>Description</h4>
<p>The f_sync function performs the same process as f_close function but the file is left opened and can continue read/write/seek operations to the file. This is suitable for applications that open files for a long time in writing mode, such as data logger. Performing f_sync of periodic or immediataly after f_write can minimize risk of data loss due to sudden blackout or unintentional disk removal. This function is not supported in read-only configuration.</p>
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<h4>References</h4>
<p><tt><a href="close.html">f_close</a></tt></p>
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